背景
- ES採用事件模型進行狀態變更，其ClusterState為其唯一持久化的叢集狀態資訊。
欄位詳解
- ES 5.3的ClusterState如下所示，主要分為
- routingTable - 路由表
- nodes - 節點資訊
- metaData - 後設資料，也可以有custom擴充套件
- blocks - 系統限制
- customs - 自定義專案，如snapshots，可用外掛擴充套件
- 下面就具體以例項說明下每個值的具體作用，在叢集中
GET _cluster/state即可看見
{
"cluster_name": "elasticsearch",
"version": 158326,
"state_uuid": "iYcpseRmQYmacnkkfZHsjg",
"master_node": "WychrvtFSFiZpChp0ElnVw",
"blocks": {
"global": { // 全侷限制
"1": { // 限制id,所有block型別見附錄
"description": "state not recovered / initialized",
"retryable": true, //是否重試，如果為true則會監聽state變化，在發生變化時自動重試
"disableStatePersistence": true, //為true將會清空之前持久化資料
"levels": [ // 限制的專案，一共有讀，寫，後設資料讀，後設資料寫四種
"read",
"write",
"metadata_read",
"metadata_write"
]
}
},
"indices": { //索引級別的限制
"xxx": {
"4": {
"description": "index closed",
"retryable": false,
"levels": [
"read",
"write"
]
}
}
}
},
"nodes": { //節點詳細資訊
"9WPdZv8ESIS9_jWv26Dogw": {
"name": "f1dba2f9-48c8-5896-97e2-983a520f1757",
"ephemeral_id": "jbV855g3QQKj8_wpeWr3Jg",
"transport_address": "1.2.3.4:9300",
"attributes": {
"box_type": "hot"
}
}
},
"metadata": { //後設資料
"cluster_uuid": "jsWIOmkxQgCkmxN5_baWmg",
"templates": {}, //模板
"indices": {
"test": {
"state": "open",
"settings": {},
"mappings": {},
"aliases": [],
"primary_terms": {
"0": 13 //代表這個shard的primary切換的次數，用於區分新舊primary
},
"in_sync_allocations": {
"0": [ // 擁有最新資料的allocation,如果primary丟失，就從這個列表裡選出個新的主.如果節點恢復，並且其id仍在這個列表中，則認為資料沒有缺少，不做恢復。當副本沒有返回ack時，primary會通知master將其從這個列表中移除，等其再返回全部ack後再加上。因此網路抖動可能造成master大量壓力
"yxSi6kjZQC2I3LhwNbOdIQ",
"xNMX9KECSm6Au3Q4R-NoQA"
]
}
}
},
"ingest": {},//ingest的pipeline資料
"index-graveyard": {
"tombstones": [ //刪掉的索引的墓碑,預設500個，防止node回來時不知道索引已經刪掉了
{
"index": {
"index_name": "append_only_sc_template_record.2017-11-25",
"index_uuid": "woWP1c_iQs-M3HHUR1XOJQ"
},
"delete_date_in_millis": 1512921691703
}
]
}
},
"routing_table": { //每個shard的具體路由資訊
"indices": {
"test": {
"shards": {
"0": [
{
"state": "STARTED", //共有四種狀態，UNASSIGNED，INITIALIZING，STARTED,RELOCATING
"primary": true,
"node": "9WPdZv8ESIS9_jWv26Dogw",
"relocating_node": null, //如果為relocating狀態，這個值表示relocating的目標機器
"shard": 0,
"index": "test",
"allocation_id": {
"id": "yxSi6kjZQC2I3LhwNbOdIQ" //當前allocation的uid，和in_sync_allocations對應
}
},
{
"state": "UNASSIGNED",
"primary": false,
"node": null,
"relocating_node": null,
"shard": 0,
"index": "test",
"recovery_source": { //恢復源,EMPTY_STORE,EXISTING_STORE,PEER,SNAPSHOT,LOCAL_SHARDS五種
"type": "PEER"
},
"unassigned_info": {
"reason": "CLUSTER_RECOVERED",
"at": "2017-09-27T03:26:36.488Z",
"delayed": false,
"allocation_status": "no_attempt"
}
}
]
}
}
}
},
"routing_nodes": { //這個就是把routing_table按照node重新整理了一下
"unassigned": [
{
"state": "UNASSIGNED",
"primary": false,
"node": null,
"relocating_node": null,
"shard": 0,
"index": "test",
"recovery_source": {
"type": "PEER"
},
"unassigned_info": {
"reason": "CLUSTER_RECOVERED",
"at": "2017-09-27T03:26:36.488Z",
"delayed": false,
"allocation_status": "no_attempt"
}
}
],
"nodes": {
"9WPdZv8ESIS9_jWv26Dogw": [
{
"state": "STARTED",
"primary": true,
"node": "9WPdZv8ESIS9_jWv26Dogw",
"relocating_node": null,
"shard": 0,
"index": "test",
"allocation_id": {
"id": "yxSi6kjZQC2I3LhwNbOdIQ"
}
},
{
"state": "STARTED",
"primary": false,
"node": "9WPdZv8ESIS9_jWv26Dogw",
"relocating_node": null,
"shard": 0,
"index": "test",
"allocation_id": {
"id": "xNMX9KECSm6Au3Q4R-NoQA"
}
}
]
}
}
}
複製程式碼
附錄
| Block Name |
id |
| STATE_NOT_RECOVERED_BLOCK |
1 |
| NO_MASTER_BLOCK_ALL |
2 |
| NO_MASTER_BLOCK_WRITES |
2 |
| INDEX_CLOSED_BLOCK |
4 |
| INDEX_READ_ONLY_BLOCK |
5 |
| CLUSTER_READ_ONLY_BLOCK |
6 |
| INDEX_READ_BLOCK |
7 |
| INDEX_WRITE_BLOCK |
8 |
| INDEX_METADATA_BLOCK |
9 |
| TRIBE_METADATA_BLOCK |
10 |
| TRIBE_WRITE_BLOCK |
11 |
參考資料